Carbon is one the strongest but lightest materials which is why it is great in helmets as it gives the player great protection whilst not affecting their game play by being to heavy.
| || XS || S || M || L || XL |
| Head width |
Temple-to-temple straight line measurement
| Head height |
Distance from top of the head to the bottom of the chin
Note: the above sizing is only an approxomate guide to help you best purchase.